single phase motor advice

[mikilianis]

Hi Andy found the non-resettable thermal fuse after dissecting the motor managed to get one going thanks for the info you are a mine of information, although to day it is so much easier to obtain information from the internet, I remember when I was doing my apprenticeship I asked my journeyman a question about the differences between an electrolytic and a dielectric capacitor, he promptly told me to go to the library and look it up because if he told me I would forget he was right but enough of my rambling
Thanks

[Justloadit]

You can go to Mantech in Cape Town and buy a replacement fuse. See here Thermal Fuse
Just remember you can not solder the fuse back in line, you must crimp it or else the heat may melt the solder.
Some more thermal cutouts here

[AndyD]

Nice work, you found the little bugger I'm also glad the fan is running after all your efforts as well.

I would advise you fit a new one rather than just bypassing it, those small motors that aren't impedance protected are a fire hazard under certain conditions so I wouldn't take a chance and leave it out entirely. I'll have a scratch in my workshop tomorrow, I'm pretty sure I have a range in stock.....exactly where they are though I'm not sure. If I can find them I'll mail you a few.

A sub-minature crimp would be best but I have no clue where you'd get them from in Cape Town, to be honest the windings max temp should be about 120-130 degrees C even under fault conditions so a soldered twist joint with a bit of heat shrink should be fine. Nowadays most of the newfandangled lead free solder melts in excess of 200 degrees C and you can also arrange the soldered joints so they're in free air a little bit away from the windings.

**Edit**
Just out of interest does it have any info stamped on it, maybe a part reference number or even an operating temperature? I can't tell from the photo.

[mikilianis]

Hi AndyD
This is one of the fan motors that I can see the fuse clearly and its the last one I opened has T3WC 250V printed on it

Regards

[AndyD]

If you carefully remove the string going across it that might be a temperature rating below where it says 250v.

That motor is a nice one to work on, the thermistor/fuse is right out in the open where it's easy to get at. Hopefully you'll be able to get all three of them running.

[mikilianis]

Tried removing the string but there is to much varnish to see any thing printed on the fuse.Yes it is easy to get to the fuse but as sods law dictates that was the last one that I opened ta da, the other two were not so simple any way thanks AndyD